Let AndroidConfig be more lenient with TTL values

[jeromegamez]

Fixes #713

• Fixed array shape for AndroidConfig objects
• Allow numeric and string values
  • Positive ints ore numeric strings matching int values are converted to strings ending with s (1 => '1s')
  • Strings matching /^\d+s$/ are passed through
  • All other values throw an InvalidArgument exception to prevent a message from being sent, just to return an error

[MGatner]

I had to look up non-empty-string - glad they accounted for the weird fact that empty('0') === true!

non-empty-string is any string except ''. It does not mean “empty” in the weird sense used by empty().

https://phpstan.org/writing-php-code/phpdoc-types#other-advanced-string-types

[codecov]

Codecov Report

Merging #714 (4b2b82c) into 6.x (960f897) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                6.x     #714      +/-   ##
============================================
+ Coverage     90.45%   90.48%   +0.03%     
- Complexity     1506     1513       +7     
============================================
  Files           151      151              
  Lines          4189     4203      +14     
============================================
+ Hits           3789     3803      +14     
  Misses          400      400              

[MGatner]

LGTM! 🥳

[jeromegamez]

Okay, I'll merge this now, if @nicodeboer76 finds something to be not working, they'll certainly let me know 😅